Books like The Seventh Secret
Irving Wallace
The Seventh Secret is 370 pages, about 6 hours 47 minutes at 250 words a minute.
12 books to read next
How long each takes
All Quiet on the Western Front 4.6 h 
Reunion 2.1 h 
Narcissus and Goldmund 5.9 h 
Doctor Faustus 10.0 h 
Beneath a Scarlet Sky 10.6 h 
Emperor 8.2 h 
The October Horse 14.5 h 
Visitation 3.5 h 
HHhH 6.3 h The Other Einstein 5.4 h 
Twee Vrouwen 3.5 h 
Every Man Dies Alone 9.5 h Bar height shows length. Estimated at 250 words a minute.